Speak!

Do you see this man who has fallen asleep while we were talking? That slumber is not a sign of heedlessness, but safety and security. Like a caravan travelling along a difficult and dangerous road on a dark night, they drive on in fear, lest harm should befall them. But as soon as the voice of a dog, or cock, reaches their ears and they find a village, they are carefree. They stretch out their legs and sleep sweetly. On the road, where not a sound or murmur would disturb them, they cannot sleep out of fear. But in the village they find security, and with all the barking of dogs and crowing of cocks, still they are happy and fall asleep. 

Our words also derive from community and security, they are the sayings of prophets and saints. When soul hears the words of those familiar friends, it feels secure and is delivered from any fear, for upon these words is wafted a scent of hope and felicity. Just as those travelers on that dark night think that every moment thieves are mingling with their caravan, so they desire to hear the words of their fellow travelers and to recognize them by their words. Once they hear their friends speak they feel secure. The same is true with you. Because your essence is subtle, glances are not enough for us, but if you speak we will then hear that familiar friend of our spirits and feel secure and at peace. So speak Mohammed!
A certain mouse inhabiting a cornfield is invisible, being so small, but once it makes a sound,  then people know it by means of its sound. And so, people are utterly immersed in the cornfield of this world, and your essence, being extremely subtle, is invisible. So speak Mohammed, that they may recognize you.
Fihi Ma Fihi - Discourse 44 - A. J. Arberry